diff --git a/RaspberryMatic.adjusted.zip b/RaspberryMatic.adjusted.zip
index ec5e43a..d77ec18 100644
--- a/RaspberryMatic.adjusted.zip
+++ b/RaspberryMatic.adjusted.zip
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:c745bb688b1e22cc8adb057983df456397371d53d14dd4f83ebf5b0e76b939fc
-size 205172546
+oid sha256:b97db9d972cca234cba9cf7a5cf82722071f7e6ef38f9f94613c025fda182233
+size 207776838
diff --git a/resize_image.sh b/resize_image.sh
index b0a3531..88d1201 100755
--- a/resize_image.sh
+++ b/resize_image.sh
@@ -11,8 +11,16 @@ if [[ $EUID -ne 0 ]]; then
 	exit 1
 fi
 
-image_file="$1"
-new_image_file="${1/\.img/\.adjusted\.img}"
+image_file="$(realpath $1)"
+new_image_file="${image_file/\.img/\.adjusted\.img}"
+
+if [[ ! $image_file =~ .*\.img ]]; then
+	echo "Not an image file: ${image_file}." 1>&2
+	exit 1
+fi
+
+echo "image: ${image_file}"
+echo "adjusted image: ${new_image_file}"
 
 echo "*** Creating new image file and partitions ***"
 dd if=/dev/zero of=$new_image_file bs=1M count=$((((${BOOT_SIZE}+${ROOT_SIZE}+${USR_LOCAL_SIZE})/1024/1024)+1))